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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Reconciliation of Weighted Average Common Shares Outstanding
A reconciliation of weighted average shares outstanding used to calculate basic net income per share and diluted net income per share follows:
 
Three months ended June 30
 
Six months ended June 30
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Weighted average shares outstanding (basic)
174,597

 
173,394

 
174,375

 
173,363

Impact of common stock equivalents
935

 
924

 
1,179

 
1,004

Weighted average shares outstanding (diluted)
175,532

 
174,318

 
175,554

 
174,367